The FHF caliber 72, which is obviously a direct relative of the FHF 67,
is a very nice classically constructed mens' watch movement.
The center second of this flat movement is directly driven;
the ring balance with screws uses a blue Nivarox-1 hairspring,
which is still non-adjustable connected to the balance cock.
The missing regulator arm gives it a slightly modern touch.
How rugged this movement is,
can be seen on the specimen shown below: It survived
an amateurisch skeletonize attempt by myself.
manual wind
sweep second
Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 3.6mm
F= 1.3mm
T= 1.9mm
21 jewels
f = 18000 A/h
power reserve 39h
Balance staff U2354 / U3145
balance with/without screws
Stem W2452
Mainspring
Zf696, 1.20 x 10.5 x 0.12 x 320mm
Hands
1.30 x 0.90 x 0.21mm